(: Add or to your mana pool.)
Blackcleave Island enters the battlefield tapped unless you control one or more creatures.
: Blackcleave Island becomes a 2/1 black and blue Horror creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Blackcleave Island becomes a 2/1 black and blue Horror creature until end of turn. It's still a land.
